Adding an Outdoor Orbi Satellite to a WiFi 6 System

As posted previously, the outdoor product can be used in extender mode with the appropriate firmware loaded.    However, remember as an AC3000 product, it's WiFi 5 and can only provide that level of performance.    In addition, as an Extender it will not be using the Orbi 5Ghz Backhaul, it extends as a "client".    This means that at "BEST" it'll connect to your AX4200 at Radio 2: 866Mbps @ 5GHz, but your client devices that connect to it will get about half as it's not using backhaul.  Is the cost of the outdoor worth about 422Mbps peak as extender on 5GHz and far less for 2.4Ghz?

As for degredation, it'll result in the lower performance anytime a device associates to that AP.    As the outdoor is quite a strong signal, it'll likely be selected by a large number of devices.    The result is reduced performance, although technically your WiFI 6 devices that connect to your AX4200 will be performing as expected.   I'd still call it degraded though.

For the significant cost of the Outdoor RBS50Y with the lower performance when not used with an AC3000 system, I'd strongly recommend saving your coin for a future AX outdoor solution.     Other consideration is if you can put a weather safe enclosure over the RBS750 and use one of those outdoors.   As long as it's plastic (or non-metallic) it shouldn't interfere with the WiFi 6 signal strength.   A number of companies make nice plastic clamshells to put AP's outdoors.   Just measure and then search for the right size.    Many are very reasonable in cost (less than $50.00).